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CHECK should not be used in tests. This test uses a net::MockCachingHostResolver, so the HostCache
argument that was being checked should never be null.

Change-Id: Ibaa7051c404037089fb010a0ed11ee8775c70277
Reviewed-on: https://chromium-review.googlesource.com/823962Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Rob Percival <robpercival@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523779}